Bicycle chain tensioner



FIG. 1 is a perspective view of the bicycle chain tensioner;

FIG. 2 is an environmental right side view with the broken line showing of fragmented bicycle spokes and frame being for illustrative purposes only and forming no part of the claimed design;

FIG. 3 is a reduced front view of the bicycle chain tensioner;

FIG. 4 is a reduced left side view of the bicycle chain tensioner;

FIG. 5 is a reduced to view of the bicycle chain tensioner;

FIG. 6 is a reduced right side view of the bicycle chain tensioner;

FIG. 7 is a reduced bottom view of the bicycle chain tensioner; and,

FIG. 8 is a reduced back view of the bicycle chain tensioner. 

The ornamental design for a bicycle chain tensioner, as shown and described. 